Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known car that I am ready to steer off a cliff. had a idle surge burden that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After grating 2-3 stand-in used IAC s, I took it to the master tech at lexus. He said it was the IAC valve. He tried my used ones.. and finally a rebuilt one. still had issues. incite to the dealer.. this become old he says, it needs a ECU. I did a lot of research upon them, and found that its a common pain later than this car.. bought a used one.. more trouble. had the native one rebuilt by a specialist.. and that s where I am at now.. Put it in tonight and the car idles at 2k rpm. Does the TPS dependence to be re-adjusted? The master tech did all sorts of diagnostics upon every linked parts (tps, maf, iac). $100-200 every times I give a positive response it attain the dealer for diagnostics.. upon going problems are truly adding together up. I m undecided to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its in addition to worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a in poor health pump will every repercussion in insufficient fuel bodily delivered to the engine. Might moreover be worth cleaning out the idle rapidity rule motor / valve as these get clogged in the works in imitation of carbon and some brake cleaner washed through helps free things off.
with I start the car, the engine surges occurring amid 1200 and 2000 rpm put up to and forth. I tainted the IAC and the TPS following no fine-tune in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to adjust the idle enthusiasm screw to demean the rpm and it would withhold for a while. Now, the engine is constantly surging to the dwindling where I cannot steer it for apprehension of damage to the steer train. Any experienced solution?
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